"It was a useful experience" is correct and usable in written English. You can use it when you want to describe a learning experience that you found beneficial. For example, "I went on a volunteer trip to Central America last month and it was a useful experience - I learned so much about the local culture and gained valuable skills."
From her feedback, it was a useful experience, as Jessica's interests lie in digital assets management and web development.
"When people talk to these accounts it's a useful experience for users," Gray said.
Ms. Gooch said that the demand to focus on one thing was a useful experience.
Synchronisation, he suggested, was a useful experience in handling the current financial crisis.
This was a useful experience for junior doctors and a requirement of their e-portfolio (a collection of evidence that demonstrates learning achievements and abilities).
Their version was ultimately not used, but it was a useful learning experience, she later said, and it brought her to the attention of people in Hollywood.
We hope the Summit will be a useful experience for practitioners, policymakers and researchers alike.
That's also been a useful experience, even though I'm now going to have to rework at least 50 pages of the book.
Meanwhile, the particular challenges of television — the rapidity, the overt comedy, the omnipresence of the business side — may prove to be a useful experience and even a source of inspiration.
Amazon Marketplace limbo has at least been a useful experience in illustrating technology's flip-side.
It's a useful way to get experience and, crucially, to build up the contacts you will need to succeed.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK